College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, PR China.
Chemosphere. 2018 Aug;205:156-165. doi: 10.1016/j.chemosphere.2018.04.108. Epub 2018 Apr 19.
Maize straw modified by iron and manganese oxides was synthesized via a simple and environmentally friendly method. Three maize straw materials, the original maize straw, maize straw modified by manganese oxides and maize straw modified by iron and manganese oxides, were detected by SEM, BET, XPS, XRD and FTIR. The results showed that maize straw was successfully modified and maize straw modified by iron and manganese oxides has a larger surface area than MS. According to the experimental data, the sorption trend could conform to the pseudo-second-order kinetic model well, and the sorption ability of tylosin on sorbents followed the order of original maize straw < maize straw modified by manganese oxides < maize straw modified by iron and manganese oxides. The study indicated that manganese oxides and iron-manganese oxides could significantly enhance the sorption capacity of original maize straw. The sorption isotherm data of tylosin on original maize straw fit a linear model well, while Freundlich models were more suitable for maize straw modified by manganese oxides and maize straw modified by iron and manganese oxides. The pH, ionic strength and temperature can affect the sorption process. The sorption mechanisms of tylosin on iron and manganese oxides modified maize straw were attribute to the surface complexes, electrostatic interactions, H bonding and hydrophobic interactions.
采用简单环保的方法合成了铁锰氧化物改性玉米秸秆。通过 SEM、BET、XPS、XRD 和 FTIR 对三种玉米秸秆材料，即原玉米秸秆、锰氧化物改性玉米秸秆和铁锰氧化物改性玉米秸秆进行了检测。结果表明，玉米秸秆成功地被改性，并且铁锰氧化物改性玉米秸秆的比表面积大于 MS。根据实验数据，吸附趋势很好地符合伪二阶动力学模型，替米考星在吸附剂上的吸附能力顺序为原玉米秸秆<锰氧化物改性玉米秸秆<铁锰氧化物改性玉米秸秆。研究表明，锰氧化物和铁锰氧化物可以显著提高原玉米秸秆的吸附能力。替米考星在原玉米秸秆上的吸附等温线数据很好地符合线性模型，而 Freundlich 模型更适合锰氧化物改性玉米秸秆和铁锰氧化物改性玉米秸秆。pH 值、离子强度和温度会影响吸附过程。替米考星在铁锰氧化物改性玉米秸秆上的吸附机理归因于表面络合、静电相互作用、氢键和疏水相互作用。
